Well-drilling tool



W. A. McCAUSLAND. WELL DRILLING TOOL. I APPLICATION FILED DEC. I4, I917.1,342,855, Patented June 8, 1920.

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WILLIAM AUGUSTUS MCCAUSLAND, 0F PITTSBURGH, PENNSYLVANIA.

. WELL-DRILLING TOOL.

Specification of Letters Patent.

Patented June 8, 1920.

Application filed December 14, 1917. Serial No. 207,162.

To all whom it may concern:

Be it known that I, WILLIAM A. MCOAUS- LAND, a citizen of the UnitedStates, and a resident of Pittsburgh, in the county of Allegheny andState of Pennsylvania, have invented a new and useful Improvement inWell-Drilling Tools, of which the following is a specification.

My invention relates to improvements in well drilling apparatus, beingmore particularly an improvement on the well drilling tool disclosed inmy Patent Number 1211198, of January 2, 1917 and it consistsin theconstruction, combinations, and arrangements herein described andclaimed.

An object of my invention is to provide a drilling tool wherein theimportant feature lies in the construction of the stem or middlesection, which includes a tube having a filler with a member embeddedtherein, the ends of said member projecting beyond the ends of the tubeto provide anchoring means whereby the stem is secured to the drill jarand bit respectively, as an additional safe-guard over the connectionafforded by the usual couplings.

Another object of the invention lies in the improvement'embodied in thedrill ar,

which includes the swivel head having a,

screw connection with the bumper.

Other objects and advantages will appear in the following specification,reference being had to the accompanying drawing, in which:

Figure 1 is a side elevation of a well drilling tool embodying theprinciples of my invention.

Fig. 2 is a detail sectional view showing certain portions of the jar.

Fig. 3 is a cross section on the line 3-3 of Fig. 1, and

Fig. 4 is a detail sectional view showing the connection of the embeddedmember in the stem with the drill jar.

In carrying out my invention, I provide the top section or drill jar 1,the middle section-or stem 2, and the third section or bit 3. Thesections are joined together by couplings 4 which screw upon thethreaded ends of the various sections as indicated in Fig. 1.

The middle section or stem 2 constitutes one of the most importantfeaturesof the bedded member 6 preferably consists of a I cable,although an iron rod or bar may be employed to equally good advantage.

The ends 6 and 6 project beyond the ends of the stem 2.' In the eventthat the embedded member 6 consists of the cable illustrated in Fig. 4,the ends are turned over, bent, knotted or otherwise enlarged as at 6,to form an abutment adapted to bind against binding screws 7 and 8 inthe ends of the ing ends 6 and 6 of the cable 6, extend into bores 9 and10 in the jar 1 and bit 3 respectively, the binding of the screws 7 and8 against the enlarged ends 6 forming an anchorage which provides anadditional safeguard against the dropping of the bit into the well inthe event of the breakage of one of the couplings.

The construction of the jar 1 constitutes another important feature ofthe invention. The jar 1 includes the swivel head 11 which has acircular recess 12 terminating in an outlet 13. The shank of a swivelbolt 14 and the head 15 of the bolt, occupy the outlet 13 and recess 12,respectively. The lower end of the swivel bolt 14 is threaded into abumper 16. The bumper 16 occupies a rectangular opening 17 in the bumperbody 18 of the jar 1. The swivel bolt 14 is movable in the bore 19 inthe upper portion of the bumper body 18 above the rectangular opening17. The function of the bumper 16 in the body 18 of the jar 1, is toloosen the bit 3 on the up-stroke ofthe drilling tool and prevent anysticking which might otherwise occur.' The purpose of the swivelconnection of the drilling tool on the swivel head 11 of the jar 1, isto allow the drilling tool to turn more freely in the bore of the well.

The advanta es of the peculiar construcjar l and bit 3, respectively.The projecttion of the drllling tool disclosed, will be the drillingtool.

readily apparent. The drilling cable to which the drilling tool isattached, does not run through the jar at the top as is the case in myformer Patent 1,211,198 of January 2, 1917. In the present instance, thejar is occupied by the swivel connections and the bumper, and the cableis attached by asuitr able coupling on the order of the one shown in thedrawing. The head 15 of the swivel bolt 14 is loosely fixed in therecess 12 of the swivel head 11, in any suitable manner. The weight ofthe drilling tool is supported by the head 15, and by reason of theswivel connection of the drilling tool to the swivel head 11, the toolmay freely rotate in the bore of the well and not cause theobjectionable twisting of the supporting cable.

The casing of the stem 2 is filled with lead for weight. As beforestated, the filler of the casing of the stem may consist of some othermaterial which may either be heavier or lighter than lead. Theemployment of lead, for instance, enables the accomplishment of a veryimportant purpose in a tool of this kind. It is possible to make thedrilling tool considerably shorter by employing an arrangement as shown,than is possible where the ordinary solid iron stem is used. Forinstance, a stem 4:} inches in diameter and 32 feet long, filled withlead weighs about. 2487 pounds, whereas a 50 foot stem of solid ironweights about 2&80 pounds. Here it will be seen that the weights aresubstantially the same, but there is a difierence of 18 feet in thelength of the respective stems, the lesser length being in favor of thestem constructed in accordance with my invention.

, Should either of the joints or couplings 4 break, theadditionalanchorage provided by the projecting ends 6* and 6 of theembedded cable 6, will prevent the bit 3 from droppingto the botom ofthe well. A laborious and time consuming fishing job is thus effectivelyavoided by the use of this particular feature in the arrangement of Itis desired to emphasize the fact that the stem 2 is anchored in thebottom of the jar 1, or more properly speakwith far better results inthis instance.

While the construction and arrangement of the device as illustrated inthe accompanying drawing is that of a generally preferred form,obviously modifications and changes may be made without departing fromthe spirit of the invention or the scope of the claims.

I claim:

1. A well drilling tool, including a jar and a bit, and an interposedconnecting stem, filled with a heavy substance as lead,

to constitute a relatively short. connection but having requisiteweight. r

2. A well drilling tool, including a jar and a bit, a stem, means forconnecting the'stem to the jar and bit, means carried by the stem andattachable to the jar and bit to provide emergency holding means shouldsaid connecting means fail, and means carried by the jar and bit forengaging said attachable means.

3. A well drilling tool, including a jar, a stem, means .for securingthe stem to the jar, auxiliary stem securing means embedded in the stemwith a projecting portion receivable by the jar, and means carried bythe jar for clamping said portion in place.

4. A well drilling tool, including 'a jar having a solid end with abore, a tubular stem with a heavy filler, coupling means for joining thestem to the jar, auxiliary joining means embedded in said fillerincluding a projecting end insertible in said bore, and

meanscarried by-the ar for engaging said inserted end.

5. A well drilling tool including a jar having a bore, a stem, couplingmeans for joining the stem to the jar, auxiliary coupling meansincluding a member carried by the stem, having a projecting end providedwith an enlargement entering the bore when the parts are assembled, andmeans carried by the jar and engaging said enlargement.

6. A well drilling tool, including a jar and a bit, and connecting meansfor the two, comprising a tubular stem having a filler of a heavysubstance, providing a relatively short connection without sacrificingthe requisite weight.

7 In a well drilling tool, the combination of the jar, the stem, and thebit, coupling members for joiningsaid members in coaxial alinement, amember embodied by the structure of the stem and including endsprojecting beyond the ends of the stem, and binding members carried bythe jar and bit for engaging said projecting ends and providing anauxiliary attachment for holding the parts together in the event ofbreakage of one of the coupling members.

8. A well drilling tool, including a stem I comprising a tube with aheavy filler, and a cable embedded in the filler, with enlarged endsprojecting beyond the ends of the tube, to cooperate with clampin means.

9. In a well drilling too a bumper body having an opening with a bore, abumper movable in the opening, a swivel bolt carried by the bumper andextending through the bore, the swivel bolt having a head, and a swivelhead having a recess for receiving the bolt head and a communicating outlet for receiving a portion ofthe swivel bolt.

10. A Well drilling tool, comprising a and secured in the bumper bodyand bit, to swivel head attachable to a cable, a bumper provideauxiliary connecting means. body having a swivel connection to saidhead, a bit supported by the bumper body, WILLIAM AUGUSTUS MCOAUSI'AND'and an interposed stem with connecting Vitnesses: means including anembedded cable having WILBER A. MCCOY,

ends projecting beyond the ends of the stem R. H. HARTLEY.

